Aiming at the problem that there will be a certain deviation （i.e. strain sensing transmission deviation） between the strain sensed by the optical fiber and the actual strain of the blade matrix during strain sensing, the strain sensing transmission characteristics of wind power blades based on optical fiber sensing are studied to establish the strain transmission analysis model. Firstly, the arrangement strategy of fiber bragg grating strain sensor is determined. Then, the effects of load, fiber （core） diameter, cladding thickness, adhesive thickness, relative position of optical fiber to blade matrix, blade material parameters on the strain and its transfer characteristics are analysed. Two layout modes, surface-attached and embedded, are considered respectively. Finally, based on the orthogonal experimental analysis of multiple factors, the relationship expression between optical fiber sensing strain （transmission value） and sensing structure parameters, optical fiber relative matrix position and material properties is established through regression analysis. The results show that the strain transfer is distributed symmetrically on the neutral layer with the increase of the embedded depth of optical fiber sensor. Young’s ModulusE1, Shear ModulusG12and Shear modulusG31have obvious effects on the strain transfer of both the two layout modes.
Key words
wind turbines /
blades /
strain measurement /
regression analysis /
optical fiber sensors
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